Armature.



No. 768,843. PATENTED AUG. 30,1904. J. BURKE.

ARMATURE.

APPLICATION: FILED NOV. 2, 1899.

H0 MODEL.

NE SES' (921/1 I v INVENTOR A41 W MW No. 768,843. Patented August 30, 190%.

UNITED STATES PATENT *"OFFICE.

JAMES BURKE, OF BERLIN, GERMANY, ASSIGNOR TO THE BURKE ELEC- TRIO COMPANY, A CORPORATION OF NEW' JERSEY.

ARIVIATURE.

SPECIFICATION forming part of Letters Patent No. 768,843, dated August 30, 1904.

Application filed November 2, 1899. Serial No. 735,592. (No model.)

To whOm it y COYWWW In the drawings, p represents an armature- 5 Be it known that I, JAMES BURKE, a citizen disk, assuming the armature to be of the lamiof the United States, residing at Berlin, in the nated construction or armature-core if the Empire of Germany, have invented certain armature be of the slotted type, and n 12 repnew and useful Improvements in Armatures, resent the slots for the reception of the armaof which the following isa full, clear, and exturewindings. The teeth formed between act specification. the slots are represented by .2-

In following This invention relates to armatures, and my invention the slots a are so located that has particular reference to themanner of setheir general direction is in a line tangential 1O curing the armature-windings upon the core to an inner circle of the armature, and prefof the armature. erably the slots follow the lines of an involute For convenience in introducing the armacurve, as illustrated in the drawings. Obture-windings it is desirable that the slots for viously the slots may be formed in a number the reception of the windings should be of of different waysfor illustration, by locat- 5 equal width throughout their-entire length; ing the inner part of the slot radially and exbut because heretofore the slots have extended tending its outer part toward the periphery in a radial direction the teeth left standing of the armature in a curve or by employingbctween the slots have either been contracted other equivalent constructions. I prefer the toward the center of the armature or the construction employing the involute curve, as

20 width of the slots has necessarily been likeshown in the drawings. The usual notches c wise contracted. Furthermore,when the slots 0 may be cut in the ends of the teeth .2 to reare radially disposed, as above described, it is ceive the usual locking strips or wedges a 0 necessary in order to place form-wound coils for retaining the armature-windings in posiof armature-windings in position to bend the tion.

5 coils out of shape while slipping the sides of ith the construction above described the the various coils over the teeth of the armaslots may be made of the same width through- 7 5 ture. out their entire length without sensibly de-- My invention therefore has for its object creasing the width of the teeth, and the depth the construction of an armature to which of the slots may therefore be materially in- 3 form-wound coils of windings may be applied creased, thus increasing the capacity of the practically without distortion and in which armature-slots and the consequent capacity of the slots may be of approximately the same the armature-windings without disturbing the sectional width throughout their entire length magnetic influence within the armature and without diminishing in any sensible degree without weakening the armature-core me- 35 the mass of iron left standing between the chanically. A further and very material adnotches. Broadly speaking, I propose to acvantage derived from this construction is that 5 complish this by locating the slots in a directhe form-wound coils (indicated by If in the tion tangential to an inner circle of the armadrawings) may be applied without distorting ture. the same. Referring to Fig. 4:, which illus- 4 The invention will be more fully described trates the present common construction emwith reference to the forms thereof shown in ploying radial notches, it will be seen that 9 the accompanyingdrawings,in which the simiwhen the lower side of the coil is placed in lar letters of reference indicate corresponding its slot, owing to the fact that the distance beparts in the various figures. tween two given slots is greater at the pc- 45 Figurel represents a side view of an armariphery of the armature than at the inner ture 0r armature-disk embodying my invenends of the slots, it is necessary in order to tion, and Fig. 3 is a modification thereof. place the winding in position to bend the side Figs. 2 and 4 are similar views of armatures of the coilout of shape in bringing it over the heretofore in common use. edge of the teeth, as illustrated in dotted lines in Fig. 4:. In following my invention the coils may be formed with their sides shaped to correspond with the lines of the slots, and these slots being very nearly parallel to each other the coils will radially describe the are necessary to place the sides of the coil in proper position. A further advantage gained by this construction is that owing to the curve or tangential form of the teeth the notches 0 are so transposed toward each other that the cross-section of the tooth is only reduced, so far as affects the magnetic induction in the armature to the extent of one notch. In the common construction shown in Fig. 2 the notches 0 0 are directly opposite each other, and thus reduce the cross-section of the tooth at that point, thus interposing a reluctance equal to the area taken out by both teeth.

By the term inner circle of the arma ture I mean an imaginary circle within the periphery of the armature, as it Will be obvious that the slots, no matter of What configuration if sufficiently prolonged, will necessarily be tangent to some circle within the periphery of the armature.

It will be understood that the constructions herein described may be modified in various respects without departing from the scope of my invention, and I therefore desire it to be understood that I do not herein limit my claims to the specific construction shown.

I claim 1. An armature having slots tangential to an inner circle for the reception of armaturewindings, said slots all being uniformly inclined, as set forth.

2. An armature having curved slots for the reception of the armature-windings, as set forth.

3. An armature comprising a plurality of plates each of which has slots tangential to an inner circle for the reception of armaturewindings, said slots being uniformly inclined and said plates being clamped together in such manner that the slots of the respective plates will register, substantially as described.

4. An armature having involute slots for the reception of the armature-windings, as set forth.

5. An armature having notches for the reception of securing devices in the teeth thereof, said notches being, transposed with respect to each other, all of the teeth and slots being uniform throughout, substantially as described.

6. An armature-tooth having securing devices on its opposite sides, said devices being located in a line other than perpendicular to the direction in which the tooth lies, substantially as described.

7. The combination of an armature having its teeth extending in a direction tangential to an inner circle, and securing devices in the respective sides of each tooth, said securing devices lying in a line parallel with the circumference of the armature, substantially as described.

8. In a dynamo-electric machine, the combination of an armature having a plurality of slots located tangentially to an inner circle, for the reception of windings, and a coil of armature-windings the opposite sides of which are formed complementary to said slots, the latter each having substantially the same tangential angle with respect to said inner circle, all of said slots being uniformly inclined, substantially as described.

9. In a dynamo-electric machine, the combination of an armature having one or more slots tangentially located with respect to an inner circle for the reception of armaturewindings, all of said slots being uniformly inclined, a coil of armature-windings having its sides formed in planes coincident with said tangential slots, and means for securing the coil to the armature, substantially as described.

10. In a dynamo-electric machine, the combination of an armature having involute slots for the reception of an armature-winding, and a coil of armature-windings having its sides in form counterpart to said slots, substantially as described.

In testimony whereof I affix my signature in 1 presence of two witnesses.

JAMES BURKE.

Witnesses HENRY HASIER, VVOLDEMAR HAUBT. 

